Futek IAA300 User manual

Tel: (949) 465-0900

Fax: (949) 465-0905

IAA300 Product Manual

- 2 -

Tel: (949) 465-0900

Fax: (949) 465-0905

Table of Contents

Default Settings ............................................................................................................................ 3

Connections .................................................................................................................................. 3

Standard Span & Zero Adjustment ........................................................................................... 4

Shunt Readings ............................................................................................................................. 5

Switch Configurations ................................................................................................................. 6

Excitation ................................................................................................................................... 6

Polarity ...................................................................................................................................... 7

Gain ............................................................................................................................................ 7

Bandwidth ................................................................................................................................. 8

Shunt .......................................................................................................................................... 8

Advanced Span and Zero Adjustment ................................................................................. 9

Adjusting the Zero ................................................................................................................... 9

Adjusting the Span................................................................................................................... 9

Appendix A (Specifications) ..................................................................................................... 10

- 3 -

Tel: (949) 465-0900

Fax: (949) 465-0905

Default Settings

 Input Range: +/-2 mV/V

 Excitation Voltage: 10 VDC

 Output Range: +/-10 VDC

 Shunt: 60.4 kΩ

Connections

Sensor Side

Wiring Code

1

Shield

2

+Excitation1

3

+Signal

4

-Signal

5

-Excitation1

Power Side

Wiring Code

1

+Vin

2

Ground

3

Shunt

4

+Vout

5

-Vout

6

Shield

WARNING:

Do not connect the device to the power supply

when the power supply is already on!

1 For 6 wire sensors connect +Sense to +Excitation and –Sense to –Excitation

6 Position Screw Terminal

5 Position Screw Terminal

Pin 1

- 4 -

Tel: (949) 465-0900

Fax: (949) 465-0905

Standard Span & Zero Adjustment

Once all of the connections are complete, you can begin to set up the sensor/amplifier

system. You will need to have the output from the IAA300 connected to a device so

you can read the voltage.

To set up the system, follow the steps below:

1. Remove any loads on the sensor.

2. Adjust the zero.

3. Apply a known load to the sensor.

4. Allow the sensor to settle.

5. Adjust the span that correlates with that load.

6. Remove the load.

7. Allow the sensor to settle.

8. Readjust the zero if needed.

Ex. If you are applying a full load to the sensor with an excitation voltage of 10 VDC,

then you would want to adjust the output (span) to 10VDC. If you are applying half of

the full load then you would want to adjust the span to exactly half of the maximum.

Once your span is set, check the zero. With no load applied to the sensor, adjust the

zero.

Note: Adjusting the zero and span is done by using a screwdriver to turn the

potentiometers (pots).

Zero

Span

Shunt

- 5 -

Tel: (949) 465-0900

Fax: (949) 465-0905

Shunt Readings

Shunt resistors simulate a load on the load cell; thus, allowing for calibration. Follow

the steps below in order to utilize the shunt feature.

1. Determine the value of the shunt resistor needed by using the Shunt Settings

spreadsheet

2. Flip the correct DIP switches to attain the corresponding value

3. Press the Shunt pushbutton

4. While the shunt is enabled and the IAA300 is reading the simulated load, adjust

the span (described above) to the correct output.

Ex. If you are using a 2 mV/V sensor with a 350 Ω bridge and the default 60.4 kΩ

resistor on the IAA300, then the simulated load would be approximately 72% of R.O.

You can then adjust the span to 7.2 VDC to correlate with this simulated load.

- 6 -

Tel: (949) 465-0900

Fax: (949) 465-0905

Switch Configurations

To change any of the switch configurations from the default settings, follow the tables

in the next few sections to set your desired configuration. The figure below shows the

default configuration.

excitation

polarity bandwidth

gain

shunt resistors

shunt button

Excitation

There are two excitation values available on the IAA300: 10 VDC (default), and 5 VDC.

To select the excitation, simply flip the DIP switch to the appropriate configuration.

The excitation voltage controls the maximum output of the amplifier.

Ex. If your application requires a lower output voltage than 10 VDC, then the 5 VDC

option is available to use. All you have to do is flip the DIP switch from the DOWN

position to the UP position.

SW1: Excitation (VDC)

UP

5

DOWN

10

1 2 3 4

- 7 -

Tel: (949) 465-0900

Fax: (949) 465-0905

Polarity

There are two polarities available on the IAA300: reverse, and straight (default). To

select the polarity, simply flip the DIP switch to the appropriate configuration.

Ex. If you are using your IAA300 with a tension and compression load cell and you

have tension setup as the positive direction, but now you would like to have

compression as the positive direction, all you have to do is flip the DIP switch from the

default polarity position (straight) to the reverse polarity position.

SW2: Polarity

UP

reverse

DOWN

straight

Gain

There are eight gain DIP switches available on the IAA300, ranging from 0.5 mV/V to 10

mV/V. The default setting is configured to 2 mV/V. Select the value closest to your

input range by flipping the DIP switches to the appropriate configuration. Use the Gain

Settings spreadsheet to help you determine which switches to flip.

Ex. If you are using a 2 mV/V sensor with a 5 VDC excitation, then you would want to

use configuration 2 for 1 mV/V. If you are using a 2mV/V sensor with a 10 VDC

excitation then you would want to use configuration 4 for 2 mV/V.

SW3: Sensitivity (mV/V)

1

UP

0.5

5

UP

2.5

DOWN

N/ A

DOWN

N/ A

2

UP

1

6

UP

3

DOWN

N/ A

DOWN

N/ A

3

UP

1.5

7

UP

4

DOWN

N/ A

DOWN

N/ A

4

UP

2

8

UP

10

DOWN

N/ A

DOWN

N/ A

- 8 -

Tel: (949) 465-0900

Fax: (949) 465-0905

Bandwidth

There are five bandwidth settings available on the IAA300: 100 Hz, 1 kHz (default), 10

kHz, 25 kHz, and 50 kHz. To select the bandwidth, simply flip the DIP switches to the

appropriate configuration.

Ex. If your application requires a higher bandwidth in order to account for the higher

frequency signals, such as those from dynamic applications, then you would want to

use the 25 kHz or 50 kHz bandwidths.

SW4: Bandwidth2

1

2

3

4

Bandwidth (Hz)

UP

DOWN

100

DOWN

UP

DOWN

1,000

DOWN

UP

DOWN

10,000

DOWN

UP

25,000

DOWN

50,000

Shunt

There are eight shunt DIP switches available on the IAA300, ranging from 30 kΩ to

432 kΩ. The default setting is configured to 60.4 kΩ. Use the online Shunt Settings

spreadsheet to help you determine which switches to flip in order to obtain a desired

output.

2 Refer to page 6 for the switch number

SW5: Shunt (kΩ)

1

UP

30

5

UP

100

DOWN

N/A

DOWN

N/A

2

UP

43.7

6

UP

150

DOWN

N/A

DOWN

N/A

3

UP

60.4

7

UP

300

DOWN

N/A

DOWN

N/A

4

UP

87.6

8

UP

432

DOWN

N/A

DOWN

N/A

- 9 -

Tel: (949) 465-0900

Fax: (949) 465-0905

Advanced Span and Zero Adjustment

Adjusting the Zero

At times, when using a signal conditioner, it is necessary to offset the zero. The IAA300

makes this simple. The zero can be adjusted approximately ±10% of R.O. by using the

potentiometer on board.

Adjusting the Span

The input jumpers vary from 0.5 mV/V to 10.0 mV/V. This allows for a large variety of

input ranges. However, it sometimes happens that the rated output from the sensor is

not exactly 2.0 mV/V or 3.0 mV/V. The IAA300 has a ±10% of R.O. adjustment range so

a sensor with an output close to one of the input ranges will work fine.

Drawing Number: EM1023 - 10 -

Tel: (949) 465-0900

Fax: (949) 465-0905

Appendix A (Specifications)

Electrical Specifications

Parameter

Min

Typical

Max

Unit

Power Supply

12.5

26

VDC

Current Consumption

100

mA

Output Impedance

10

Ohms

Sensor Impedance

350

5000

Ohms

Bandwidth (Setting 1)

100

Hz

Bandwidth (Setting 2)

1000

Hz

Bandwidth (Setting 3)

10000(1)

Hz

Bandwidth (Setting 4)

25000(2)

Hz

Bandwidth (Setting 5)

50000(3)

Hz

Common Mode Rejection Ratio

120

dB

Noise

2

mVp-p

Output Span Range

-10

10

% of FSR

Output Zero Range

-10

10

% of FSR

Gain Drift with Temperature

-25

X

25

PPM of FSR

Internal Non-Linearity

-0.01

X

0.01

% of FSR

Zero Drift with Temperature

-25

X

25

PPM of FSR

1 Only for Sensitivity of 1.0 mV/V or Greater

2 Only for Sensitivity of 1.5 mV/V or Greater

3 Only for Sensitivity of 1.5 mV/V or Greater

Futek IAA300 User manual

Futek IAA300 User manual

Related papers

Other documents